Re: [Qemu-devel] kvm segfaulting

[Stefan Priebe - Profihost AG]

So it looks a bit like a race condition in the virtio-scsi driver.
Command got canceled and the completed or something like this.

Stefan

Am 11.02.2013 10:40, schrieb Stefan Hajnoczi:
> On Mon, Feb 11, 2013 at 08:46:03AM +0100, Stefan Priebe - Profihost AG wrote:
>> i've seen segfaults of the kvm process. Sadly i've no core dumps just
>> the line from dmesg:
>> kvm[26268]: segfault at c050 ip 00007fcfc3465eac sp 00007fffe85a0d00
>> error 4 in kvm[7fcfc3223000+3ba000]
>>
>> Is it possible to get the function and some more details out of this
>> line? I've symbol files and debugging files of the kvm binary.
> 
> Accessed address: c050
> Address of the instruction that segfaulted: 00007fcfc3465eac
> Base memory address where kvm code was mmapped: 7fcfc3223000
> Length of mmap: 3ba000
> 
> Try the following:
> 
>   $ printf '%x' $((0x7fcfc3465eac - 0x7fcfc3223000))
>   242eac
>   $ addr2line -e path/to/qemu-kvm-symbols -f 242eac
> 
> I also suggest posting about 10 lines before/after 0x242eac from the
> objdump -d path/to/kvm output.  That way we can sanity check that the
> instruction accesses memory and see what the surrounding instructions
> are doing.
> 
> Stefan
>